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Finding the Fourth Proportional to 1,313.72, 1,970.04 and 655.37

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Solution

The fourth proportional to 1,313.72, 1,970.04 and 655.37 is: 982.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.72 : 1,970.04 = 655.37 : x
  2. Step 2: Convert to fraction form
    1,313.72/1,970.04 = 655.37/x
  3. Step 3: Cross multiply
    1,313.72x = 1,970.04 × 655.37
  4. Step 4: Simplify right side
    1,313.72x = 1,291,095.26
  5. Step 5: Solve for x
    x = 1,291,095.26/1,313.72
  6. Step 6: Final answer
    x = 982.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.